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Then, in 1883, he followed up this discovery
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with another that was almost equally influential.
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In 1883, he isolated the Vibrio cholerae.
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Koch then had discovered and demonstrated
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the role of pathogens,the ones responsible for two
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of the most prevalent and feared nineteenth century diseases.
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This marked, as I said,
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the definitive triumph of contagionism.
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And the 1880s and '90s were a golden age of microbiology,
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with the pathogens being discovered
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for a whole range of other diseases.
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This was an extraordinary period in medical science.